Small-sized ferrite chip antenna

Abstract

The invention discloses a small-sized ferrite chip antenna. The small-sized ferrite chip antenna comprises: a base ferrite diaphragm, upper slash segments, lower slash segments and metal connecting bars, wherein one or more upper slash segments are obliquely arranged above the base ferrite diaphragm and one or more lower slash segments are obliquely arranged below the base ferrite diaphragm. The upper slash segments are connected with the lower slash segments with the metal connecting bars positioned in the base ferrite diaphragm so as to form a spiral coil wound around a horizontal axis. An upper surface diaphragm is arranged above the upper slash segment, a lower surface diaphragm is arranged below the lower slash segment, a surface electrode is arranged above the upper surface diaphragm and a bottom electrode is arranged below the lower surface diaphragm. The surface electrode and the bottom electrode are connected with each end of the spiral coil by the metal connecting bars. According to this arrangement, the antenna is wound around the horizontal axis, so that the magnetic field of the antenna is parallel to grooves and the attenuation caused by being orthogonal to the grooves can be avoided.

Description

technical field [0001] The invention discloses an antenna, in particular to a small ferrite chip antenna suitable for cards, labels and hand-held reader-writers. Background technique [0002] In recent years, there have been more and more applications of radio frequency identification technology (RFID) and near field communication technology (NFC). In order to communicate between mobile electronic devices such as mobile phones or between mobile electronic devices and readers, a common solution in the prior art is to equip mobile electronic devices with identifiable cards with communication antennas. Usually, The identifiable card is installed in the metal card slot of the mobile electronic device. Please see attached Figure 1 to Figure 3 , Figure 1 to Figure 3 It is a schematic diagram showing the form of communication of a card 11 equipped with a PWB (English Printed wire board, the official translation is a printed circuit board) antenna 13 in the card slot 12. ...

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Problems solved by technology

Please see attached Figure 1 to Figure 3 , Figure 1 to Figure 3 It is a schematic diagram showing the form of communication of a card 11 equipped with a PWB (English Printed wire board, the official translation is a printed circuit board) antenna 13 in the card slot 12. image 3 In the example shown above, in the electromagnetic waves emitted by the PWB antenna 13 in the card 11, most of the magnetic field H is perpendicular to the metal card slot 12, and its strength will be greatly reduced due to attenuation such as metal reflection and absorption.

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